/Engine/Source/Developer/HierarchicalLODUtilities/Public/IHierarchicalLODUtilities.h
Computes the LODLevel for a StaticMeshComponent taking into account the ScreenSize
int32 GetLODLevelForScreenSize ( const [UStaticMeshComponent](API\Runtime\Engine\Components\UStaticMeshComponent) * StaticMeshComponent, const float ScreenSize )